c++ - Template detects if T is pointer or class -

considering following code:

class myclass {     ... };  template <typename object> class list { public:      void insert(const object & x)     {         // call when object myclass     }      void insert(const object & x)     {         // call when object myclass*     } }  int main() {     myclass a;      list<myclass> lst;     list<myclass*> plst;      lst.insert(a);     plst.insert(new myclass);      return 0; } 

how tell compiler call different methods based on if template class or pointer?

how fix code above?

you can use combination of std::is_pointer , std::enable_if:

#include <type_traits> #include <iostream>  class myclass { };  template <typename object> class list { public:      template<class t=object>     void insert(t t, typename std::enable_if<std::is_pointer<t>::value >::type* = 0)      {         std::cout << "insert pointer" << std::endl;     }      template<class t=object>     void insert(t t, typename std::enable_if<!std::is_pointer<t>::value >::type* = 0)      {         std::cout << "insert non-pointer" << std::endl;     } };  int main() {     myclass a;      list<myclass> lst;     list<myclass*> plst;      lst.insert(a);     plst.insert(new myclass());      return 0; } 

live example: https://ideone.com/ck8zdo

this allow insert both pointers , non-pointers pointer or non-pointer list. if want restrict that, can use this:

#include <type_traits> #include <iostream> class myclass { };  template <typename object> class list { public:      template<class t=object>     void insert(t t, typename std::enable_if<std::is_same<t,object>::value&&std::is_pointer<t>::value >::type* = 0)      {         std::cout << "insert pointer" << std::endl;     }      template<class t=object>     void insert(const t& t, typename std::enable_if<std::is_same<t,object>::value&&!std::is_pointer<t>::value >::type* = 0)      {         std::cout << "insert non-pointer" << std::endl;     } };  int main() {     myclass a;      list<myclass> lst;     list<myclass*> plst;      lst.insert(a);     // plst.insert(a); // compiler error      // lst.insert(new myclass()); // compiler error     plst.insert(new myclass());       return 0; } 

live example: https://ideone.com/3dtbfr